package com.hmdp.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.redisson.Redisson;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Autowired
    private ISeckillVoucherService seckillVoucherService;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Autowired
    private RedisIdWorker redisIdWorker;
    @Autowired
    private RedissonClient redissonClient;

    @Override
    public Result seckill(Long voucherId) {
        // 1.查询优惠券
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        // 2.判断秒杀是否开始
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            // 尚未开始
            return Result.fail("秒杀尚未开始！");
        }
        // 3.判断秒杀是否已经结束
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            // 尚未开始
            return Result.fail("秒杀已经结束！");
        }
        // 4.判断库存是否充足
        if (voucher.getStock() < 1) {
            // 库存不足
            return Result.fail("库存不足！");
        }
        Long userId = UserHolder.getUser().getId();
        //创建锁对象(新增代码)
        //SimpleRedisLock lock = new SimpleRedisLock( stringRedisTemplate,"order:" + userId);
        RLock lock = redissonClient.getLock("lock:order:" + userId);
        //获取锁对象
        boolean isLock = lock.tryLock();
        //加锁失败
        if (!isLock) {
            return Result.fail("不允许重复下单");
        }
        try {
            //获取代理对象(事务)
            //IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return createVoucherOrder(voucherId);
        } finally {
            //释放锁
            lock.unlock();
        }
    }

    @Override
    @Transactional
    public Result createVoucherOrder(Long voucherId) {
        Long userId = UserHolder.getUser().getId();
        SeckillVoucher seckillVoucher = seckillVoucherService.getById(voucherId);
        int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
        if (count>0){
            return Result.fail("您已经购买过了");
        }

        // 7.创建订单
        VoucherOrder voucherOrder = new VoucherOrder();
        // 7.1.订单id
        long orderId = redisIdWorker.nextId("order");
        voucherOrder.setId(orderId);
        // 7.2.用户id
        voucherOrder.setUserId(userId);
        // 7.3.代金券id
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);
        LambdaUpdateWrapper<SeckillVoucher> wrapper=new LambdaUpdateWrapper<>();
        wrapper.set(SeckillVoucher::getStock,seckillVoucher.getStock()-1);
        wrapper.eq(SeckillVoucher::getVoucherId,seckillVoucher.getVoucherId());
        seckillVoucherService.update(wrapper);
        return Result.ok(orderId);
    }
}
